ฤรจn pin
ฤรจn pin, flashlight
Biแปu tฦฐแปฃng cแบฃm xรบc nร y thแป hiแปn mแปt chiแบฟc ฤรจn pin cแบงm tay ฤฦฐแปฃc sแปญ dแปฅng ฤแป chiแบฟu sรกng nhแปฏng nฦกi tแปi tฤm. Nรณ thฦฐแปng ฤฦฐแปฃc sแปญ dแปฅng ฤแป thแป hiแปn cรกc hoแบกt ฤแปng cแบฏm trแบกi hoแบทc ngoร i trแปi.
Nรณ biแปu thแป mแปt cรดng cแปฅ ฤฦฐแปฃc sแปญ dแปฅng ฤแป tรฌm ฤฦฐแปng vร o ban ฤรชm hoแบทc trong thแปi gian mแบฅt ฤiแปn. Biแปu tฦฐแปฃng cแบฃm xรบc nร y cลฉng ฤฦฐแปฃc sแปญ dแปฅng ฤแป biแปu thแป chแปฉc nฤng ฤรจn flash cแปงa ฤiแปn thoแบกi thรดng minh.
Biแปu tฦฐแปฃng cแบฃm xรบc nร y thแป hiแปn mแปt chiแบฟc ฤรจn pin cแบงm tay ฤฦฐแปฃc sแปญ dแปฅng ฤแป chiแบฟu sรกng nhแปฏng nฦกi tแปi tฤm. Nรณ thฦฐแปng ฤฦฐแปฃc sแปญ dแปฅng ฤแป thแป hiแปn cรกc hoแบกt ฤแปng cแบฏm trแบกi hoแบทc ngoร i trแปi.
Nรณ biแปu thแป mแปt cรดng cแปฅ ฤฦฐแปฃc sแปญ dแปฅng ฤแป tรฌm ฤฦฐแปng vร o ban ฤรชm hoแบทc trong thแปi gian mแบฅt ฤiแปn. Biแปu tฦฐแปฃng cแบฃm xรบc nร y cลฉng ฤฦฐแปฃc sแปญ dแปฅng ฤแป biแปu thแป chแปฉc nฤng ฤรจn flash cแปงa ฤiแปn thoแบกi thรดng minh.
ฤรขy lร hรฌnh แบฃnh ฤแบกi diแปn hiแปn ฤแบกi cแปงa ฤรจn pin ฤiแปn cแบงm tay, ฤฦฐแปฃc phรกt minh lแบงn ฤแบงu tiรชn แป Anh vร o nฤm 1899. Trong thแปi ฤแบกi kแปน thuแบญt sแป, nรณ cลฉng ฤฦฐแปฃc sแปญ dแปฅng theo nghฤฉa bรณng lร "khรกm phรก sแปฑ thแบญt" hoแบทc "tรฌm ra giแบฃi phรกp".
ฤฦฐแปฃc cรดng nhแบญn trรชn toร n thแบฟ giแปi lร mแปt vแบญt dแปฅng thiแบฟt yแบฟu ฤแป chuแบฉn bแป cho thแบฃm hแปa, nรณ ฤรฃ trแป thร nh mแปt cรดng cแปฅ tฦฐแปฃng trฦฐng cho sแปฑ an toร n vร sแปฑ chuแบฉn bแป. Gแบงn ฤรขy, nรณ cรณ liรชn quan ฤแบฟn cรกc phong trร o bแบฃo vแป mรดi trฦฐแปng, vร sแปฑ phแป biแบฟn cแปงa ฤรจn pin nฤng lฦฐแปฃng mแบทt trแปi ฤang tแบกo ra mแปt vฤn hรณa chiแบฟu sรกng bแปn vแปฏng.